Skyshine vs Direct Dose in MCNP5

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SUMMARY

The discussion focuses on the definition and calculation of skyshine dose in MCNP5, particularly in scenarios involving a source and shielding. Participants highlight the significance of using an importance setting (imp:p 0) to optimize calculations, noting that this approach yields results comparable to more complex methods while enhancing computational efficiency. The concept of skyshine is clarified as radiation scattered by air outside of radiological shielding, especially relevant when considering distances from the source to the dose point.

PREREQUISITES
  • Understanding of MCNP5 (Monte Carlo N-Particle Transport Code) version 5
  • Knowledge of radiation shielding principles
  • Familiarity with importance sampling in Monte Carlo simulations
  • Basic concepts of radiation scattering and dose calculation
NEXT STEPS
  • Research the implementation of importance sampling in MCNP5 for optimized calculations
  • Study the effects of distance on skyshine dose contributions in radiation transport
  • Explore advanced shielding techniques and their impact on dose calculations
  • Examine case studies involving skyshine in complex geometries using MCNP5
USEFUL FOR

Radiation physicists, nuclear engineers, and professionals involved in radiation safety and shielding analysis will benefit from this discussion, particularly those utilizing MCNP5 for dose calculations in complex environments.

Will_007
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TL;DR
how to calculate skyshine dose with mcnp?
Hello - what is an accepted definition of the skyshinne dose in MCNP and how would you calculate this? If you have a source and a shield a few meters away between the dose point, the contribution that goes around the shield would be skyshine....but..what if you have a big source region (e.g., a building) and your dose point is a mile away - how would you separate skyshine component?

Thanks
 
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Hi, you can consider an importance (imp:p 0) 0, in the primary barrier
 
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PSRB191921 said:
Hi, you can consider an importance (imp:p 0) 0, in the primary barrier
Hey - yeah. This was my ultimate choice. Initially I put in a slab with really high fictitious density in the middle of my shield (to allow stuff to scatter back and around to the dose location), but ran a test case and imp=0 was way faster and almost identical results.

if there is no shield (other than air), and source is 50 yards away from the dose point, what does skyshine mean to you?
 
"Skyshine" is a radiation scattered by sky air, outside the radiological
shielding.
In the first figure (geometry definition) in the second results with MCNP (reference Radiation Problems : From Analytical to Monte-Carlo Solutions ) :
skyshine.jpg
skyshineMCNP.jpg
 
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thanks
 

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